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Details, datasheet, quote on part number:3161
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Datasheet text preview:
3161
HALL-EFFECT SWITCH FOR 2-WIRE APPLICATIONS
This Hall-effect switch is a monolithic integrated circuit designed to operate continuously over extended temperatures to +85°C. The unipolar switching characteristic makes this device ideal for use with a simple bar or rod magnet. The A3161ELT and A3161EUA are identical except for package. Each device includes a voltage regulator for operation with supply voltages of 3.5 to 25 volts, reverse battery protection diode, quadratic Hall-voltage generator, temperature compensation circuitry, small-signal amplifier, Schmitt trigger, and a constant-current open-collector output. Noise radiation is limited by control of the output current slew rate. Two package styles provide a magnetically optimized package for most applications. Suffix `LT' is a miniature SOT-89/TO-243AA transistor package for surface-mount applications; suffix `UA' is a threelead ultra-mini SIP for through-hole mounting.
Data Sheet 27621.30B
V
X
CC
1
2
3
GROUND
Dwg. PH-003-3
OUTPUT
SUPPLY
FEATURES and BENEFITS
s s s s s s s s s
Pinning is shown viewed from branded side.
ABSOLUTE MAXIMUM RATINGS
at TA = +25°C Supply Voltage, VCC Continuous ......... 28 V Surge (tw 100 ms) ........... 40 V Reverse Battery Voltage, VRCC Continuous ........ -25 V Surge (tw 100 ms) .......... -40 V Magnetic Flux Density, B ....... Unlimited Output OFF Voltage, VOUT ..... 28 V Operating Temperature Range, TA ..... -40°C to +85°C Storage Temperature Range, TS ... -65°C to +170°C
Internal Current Regulator for 2-Wire Operation Output Slew Rate Controlled 3.5 V to 25 V Operation ... Needs Only An Unregulated Supply Reverse Battery Protection Excellent Temp. Stability Activate with Small, Commercially Available Permanent Magnets Small Size Solid-State Reliability ... No Moving Parts Resistant to Physical Stress
Always order by complete part number, e.g., A3161ELT .
3161 HALL-EFFECT SWITCH FOR 2-WIRE APPLICATIONS
ELECTRICAL CHARACTERISTICS over operating voltage and temperature ranges.
Limits Characteristic Supply Voltage Load Current (2-wire application) Symbol VCC IOUT + ICC Test Conditions Operating 3.5 V VOUT BOP Output Current I OUT IOFF Output Saturation Voltage Output Slew Rate Output Settling Time V OUT di/dt t sd B BOP IOUT = 5 mA, B < BRP CL = 20 pF CL = 20 pF Min. 3.5 12 12 -- -- -- -- -- Typ. -- 15 15 3.5 12 <1.0 0.9 7.0 -- Max. 25 17 19 5.0 -- 10 1.5 20 20 Units V mA mA mA mA µA V mA/µs µs
MAGNETIC CHARACTERISTICS over operating supply voltage range.
Limits At TA = +25°C Characteristic Operate Point (output turns OFF) Release Point (output turns ON) Hysteresis (BOP - BRP) Symbol BOP BRP B hys Min. 30 5.0 Typ. 130 110 20 Max. 160 Over Oper. Temp. Range Min. 30 5.0 Typ. 130 110 20 Max. 160 80 Units G G G
NOTE: Typical values are at TA = +25°C and VCC = 12 V.
FUNCTIONAL BLOCK DIAGRAM
1
VCC
3
OUTPUT
REG.
X
2
GROUND
Dwg. FH-017
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright © 1998, 2002 Allegro MicroSystems, Inc.
3161 HALL-EFFECT SWITCH FOR 2-WIRE APPLICATIONS
TYPICAL OPERATING CHARACTERISTICS
SWITCH POINTS
200
TOTAL SUPPLY CURRENT
20
+ I CC ) in mA
VCC = 25 V 15 VCC = 3.5 V
150
B < BRP
SWITCH POINT in GAUSS
OPERATE POINT
100
RELEASE POINT
TOTAL SUPPLY CURRENT (I
OUT
10
50
5.0 VCC = 25 V VCC = 3.5 V 0 -50 B > BOP
OVER OPER. VOLT. RANGE
0 -50 -25 0 25 50 75 100 125 150
-25
0
25
50
75
100
125
150
AMBIENT TEMPERATURE in °C
Dwg. GH-044-1
AMBIENT TEMPERATURE in °C
Dwg. GH-028-4
OUTPUT SATURATION VOLTAGE
1200
SAFE OPERATING AREA
30
MAXIMUM CONTINUOUS SUPPLY VOLTAGE in VOLTS
1000
25
SATURATION VOLTAGE in mV
800
20 PACKAGE SUFFIX CODE -UA 15 PACKAGE SUFFIX CODE -LT 10
600
400
200
IOUT = 5 mA VCC = 10 V
5
0 -50
0
-25
0
25
50
75
100
125
150
20
40
60
80
100
120
140
160
180
AMBIENT TEMPERATURE in °C
Dwg. GH-029-3
AMBIENT TEMPERATURE in °C
Dwg. GH-068
www.allegromicro.com
3161 HALL-EFFECT SWITCH FOR 2-WIRE APPLICATIONS
SENSOR LOCATIONS
Suffix "LT"
ACTIVE AREA DEPTH 0.0305" 0.775 mm NOM 0.085" 2.16 mm 0.045" 1.14 mm
OPERATION
The output of these devices (pin 3) switches OFF when the magnetic field at the Hall sensor exceeds the operate point threshold (BOP). When the magnetic field is reduced to below the release point threshold (BRP), the device output switches ON. The difference in the magnetic operate and release points is called the hysteresis (Bhys) of the device. This built-in hysteresis allows clean switching of the output even in the presence of external mechanical vibration and electrical noise.
15
A
1 2 3
12
BOP
Dwg. MH-008-7A
OUTPUT CURRENT in mA
9.0
Suffix "UA"
ACTIVE AREA DEPTH 0.0195" 0.50 mm NOM 0.078" 1.98 mm
6.0
TA = +25°C
3.0
BRP
A
BRANDED SURFACE 1 2 3
0.054" 1.36 mm
0 0 25 50 75 100 125 150 175 200 MAGNETIC FLUX DENSITY in GAUSS
Dwg. GH-007-1
APPLICATIONS INFORMATION
Dwg. MH-011-8A
Allegro
These devices are normally operated in a 2-wire mode, where the supply terminal and the output terminal are tied together. An external comparator detects the change in total supply current by the addition (output off, B > BOP) or subtraction (output on, B < BRP) of IOUT. Hall effect applications information is available in the "Hall-Effect IC Applications Guide", which can be found in the latest issue of the Allegro MicroSystems Electronic Data Book, AMS-702 or Application Note 27701, or at www.allegromicro.com .
TYPICAL 2-WIRE APPLICATION
SUPPLY Icc + IoUT
3
0.1 µF
0.85 V
+
2
V
CC
100
Dwg. EH-011A
X
1
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000
3161 HALL-EFFECT SWITCH FOR 2-WIRE APPLICATIONS
PACKAGE DESIGNATOR `LT'
(SOT89/TO-243AA) Dimensions in Inches (for reference only) Dimensions in Millimeters (controlling dimensions)
0.181 0.173 0.072 0.064 0.167 0.155 0.102 0.090
0.063 0.055
0.0173 0.0138
4.60 4.40 1.83 1.62 4.25 3.94 2.60 2.29
1.60 1.40
0.44 0.35
1
2
3
0.090 0.084
1
2
3
2.29 2.13
0.047 0.035 0.059
BSC
0.0189 0.0142 0.0221 0.0173 0.118
BSC
Dwg. MA-009-3A in
1.20 0.89 1.50
BSC
0.48 0.36 0.56 0.44 3.00
BSC
Dwg. MA-009-3A mm
0.098 0.079 B A 0.031 0.102 0.181 3 0.047 0.031
TYP
2.5 2.0 B A 0.8 2.6 4.6 1.2 0.8
TYP
1 0.028
TYP
2
1 0.7
TYP
2
3
Pads 1, 2, 3, and A -- Standard SOT89 Layout Pads 1, 2, 3, and B -- Low-Stress Version Pads 1, 2, and 3 only -- Lowest Stress, But Not Self Aligning
Dwg. MA-012-3 in
Pads 1, 2, 3, and A -- Standard SOT89 Layout Pads 1, 2, 3, and B -- Low-Stress Version Pads 1, 2, and 3 only -- Lowest Stress, But Not Self Aligning
Dwg. MA-012-3 mm
NOTES: 1. Exact body and lead configuration at vendor's option within limits shown. 2. Supplied in bulk pack (500 pieces per bag) or add "TR" to part number for tape and reel. 3. Only low-temperature (240°C) reflow-soldering techniques are recommended for SOT89 devices.
www.allegromicro.com
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